PH meter



FIG. 1 is a right front perspective view of a pH meter showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereto;

FIG. 3 is a front elevational view thereof as taken from line 3--3 of FIG. 2;

FIG. 4 is a rear elevational view thereof as taken from line 4--4 of FIG. 2. 

The ornamental design for a pH meter, as shown and described. 